Weighing-machine.



G. WALKER.

WBIGHIN G MACHINE. APPLICATION FILED APR.13, 1911.

1,103,456. Patented Ju1y'14,1914.

IVITNESSES: LVVENTOR.

. MM 7 I 619mg? l VZzZ/Yem A TTORNEY.

UNITED STATES PATENT OFFICE- GEORGE WALKER, OF NEW BRITAIN, oonniicrrco'r, ASSIGNOR To Lannnns, TRARY & CLARK, or NEW BRITAIN, CONNECTICUT,a conronarron or CONNECTICUT.

wnremne-uaonmn.

Patented July 1 1, 1914.

Application filed April 13, 1911. Serial No. 620,884.

Machines.

. My invention relates to improvements in weighing scales andparticularly to spring scales of the rack and pinion class, the objectof the invention being to provide a simple and easily accessiblemechanism by means of which the scale can be accurately adjusted afterit is assembled so that it will weigh correctly under varying conditionsof use. I

In the drawings-Figu-re 1 is a sectional view of scale in which myinvention is embodied. Fig; 2 is a rear View of the operative mechanismof the scale. Fi .3 is a sectional side view of an inclined ial scaleshowing another embodiment of the invention,

Referring particularly to Figs. 1 and 2 of the drawings, a is the basesupporting the casing in which is attached thereto and which contains.the operative mechanism of the scale.

c is the dial and a; the pointer actuated by rack and pinion mechanismin a well known manner.

The usual operative mechanism of a scale of this type comprises a saddleld fixcd in position in the rear ofthe casing, a platform frame 11projecting through top of the casing and to which .the platfdrm 12 issecured, a lever frame 13 extending between the upper end of the saddlemember and the platform frame and pivotally attached to both, aconnecting'rod 14 extending between the lower part of the saddle and thelower part of the platform frame and pivotally connected to both and abalance spring 15, having its lower end attached to the platformframeand its upper end supported by a fixed part, as the top of thecasing, with means as the threaded stud 16 and the thumb nut 17, foradjusting the tension of the spring.

-It is an essential in the construction of the operative mechanism of ascale of this character that the lever frame and connecting rod. shouldbe positioned and maintained in parallelism. with one another.Heretofore the ends of these two members WAL ER, a

had been connected with the saddle and platform frame by pintles andpivot pins, accurate drilling of the various parts and fitting'of thepintles and pivots being re- 7 lied upon to establish the correctrelation between the lever frame and connecting rod. It is ObVlOUS thatby these methods it has been very diflicult to correctly position thevarious parts of the operative mechanism.

By my invention 1 provide and adjustable mechanism by means of which theparallelism of the lever frame and connecting rod can be establishedaccurately after the parts of the operative mechanism are assembled. Inthe embodiment of the invent-ion illustrated in Figs. 1 and 2, I haveshown this adjusting mechanism as located at the point of attachment ofthe connecting rod to the saddle. The saddle is provided withatransverse bar 20, having'an apertured boss 21 through which a threadedstud 22 extends engaged by nuts above and below the boss, the head ofthe stud being bifurcated, as at 23, to receive the end'of theconnecting rod 13, which is secured in place by the pivot pin 24. Itwill thus be seen that by loosening one of these nuts and operating the.

other, the stud can be raised or lowered and the connecting rod broughtinto prop r position and relation with respect to the lever frame, andthen locked against accidental displacement. It is apparent that thisadjustable connection could well be located at either point ofattachment of the lever frame or connecting rod with the saddle orplatform frame. but it is advisable to so locate it that it will bereadily accessible.

In the modification shown in Fig. 3 the form of the rear end of theconnecting rod is altered and the pintle 30 is carried in a frame 31,which slides between the sides of the saddle, the central part of theframe having a lip 32 into which the adjusting screw 33 is threaded. v

It is apparent that the device is susceptible of embodiment in otherforms without departing from the spirit of my invention.

I claim as my invention:

1. The combination with a weighing other pair and a casing for saidmechanism with respect to which said adjustment is wholly independent. l

2. In a weighing scale a fixed saddle, a movable platform frame, a leverframe extending :between the saddle and the platform frame and pivotallyconnected therewith, a stud adjustably supported in said saddle andhaving a bifurcated head, a connecting rod extending between andpivotally connected with said platform frame and stud head, and abalance spring operatively connected with said platform frame.

3. In a Weighing scale a combination with a saddle, a platform frame, abalance spring having a fixed support for one end and connected at itsopposite end with said platform frame, a lever frame extending betweensaid saddle and said platform frame and. pivotally connected with both,a transverse bar fixed in said saddle near the lower nected with both.

. GEORGE WALKER. Witnesses:

CHARLES WVIEGAND, R. C. CLAPP.

